Multiple levels as in the mmo
Is it possible to have multiple scenes at the same time?
For example, I have a game that is a city and players can enter the interiors of these, my idea is that to save resources, the interior of each building is an independent scene, so there may be 2 players inside the building A, 5 players inside the building B and 3 players inside the building C, in addition, they may have the freedom to move between the entire city and the interiors of the buildings. It is as if it were an mmo.
I have worked on a scene where all the players connect and once they are all ready, I can send them all to scene A, B and so on but I really don't know in this case what points to consider when keeping all the objects synchronized.